Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea0abab903dd72e1…

MALICIOUS

PDF

40.3 KB Created: 2020-08-12 01:25:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 29420f226fa0d279c058c3a5c676ec10 SHA-1: 24c2b748dab64250c10b9931d274e6a9449810a7 SHA-256: ea0abab903dd72e1956bd4da4f1c1e4240656def5fb264dd70fe101325a8f223
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, many of which point to a redirector service (ttraff.com) known for malicious activity. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains URLs that are consistent with a link farm or redirection scheme. No scripts were extracted, but the primary attack vector appears to be the malicious redirection links.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.com/wb?keyword=tesseract%20pdf%20files
    • http://files.robbfreemethodisthistoricalcentre.com/uploads/1/3/2/6/132682663/miwizizujo.pdf
    • http://files.historicaldivingequipment.com/uploads/1/3/0/7/130739544/konolavu.pdf
    • http://files.soilihuhtakallio.com/uploads/1/3/1/3/131379899/2bd2d87.pdf
    • http://files.broadwingadventures.com/uploads/1/3/1/1/131163872/fedfc53d.pdf
    • http://bepuza.celiadoesscience.com/uploads/1/3/1/0/131071114/d8f96.pdf
    • https://cdn.shopify.com/s/files/1/0437/9394/0629/files/aristophanes_lysistrata_trke.pdf
    • https://cdn.shopify.com/s/files/1/0432/4399/5298/files/48267053055.pdf
    • https://cdn.shopify.com/s/files/1/0427/6686/0455/files/pinowutugelavopiferivifu.pdf
    • https://cdn.shopify.com/s/files/1/0431/0469/8535/files/bycatch_reduction_devices.pdf
    • https://cdn.shopify.com/s/files/1/0431/6073/1808/files/gefusamovabewox.pdf
    • https://cdn.shopify.com/s/files/1/0430/7995/8679/files/52428479091.pdf
    • https://cdn.shopify.com/s/files/1/0435/0250/2054/files/everything_i_never_told_you_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/12086745869.pdf
    • https://cdn.shopify.com/s/files/1/0435/0610/6528/files/therapeutic_classification_of_drugs_2020.pdf
    • https://cdn.shopify.com/s/files/1/0430/7940/1632/files/79863814387.pdf
    • https://cdn.shopify.com/s/files/1/0427/8406/3654/files/pokemon_platinum_rare_candy_codes.pdf
    • https://cdn.shopify.com/s/files/1/0446/1517/2259/files/beckman_oral_motor_intervention.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000607e.bin
4ce815c2ee694d707f7fdcb0575fcafd593a1bc8e2a6c0841b4b91b8cfef4d4d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x607E 5100 bytes
font_01_sfnt_off000071df.bin
9506cd7ef82bcc3108d5c4818ce8eb8771b3d95670e75516f09aa2dcaa21e6af		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71DF 10112 bytes

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